Pumping-engine



(No Model.) s Sheets She'et 1.

' J. W. BOOTH.

. -P UMPING-ENGINE. No. 540,898. Patented June 11, 1895.

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No. 540,898. Patented June 11, 1895.

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3 -Sheets--Sheet 3.

(No Model.)

110. 540,898 Patnted June 11, 1895.

UNITED STATES PATENT OFFICE.

JOHN W. BOOTH, OF PHILADELPHIA, PENNSYLVANIA.

PUMPING-ENGINE.

SPECIFICATION forming part of Letters Patent No. 540,898, dated June 11, 1895. I

7 Application filed March 6, 1895.

To aZZ whom it may concern:

Be it known that 1, JOHN W. BOOTH, a citi- 'zen of the United States, and a resident of the city of Philadelphia, State of Pennsylvania, have invented certain new and useful Improvements in Pu mping-Engines, of which the following is a full, clear, and exact description, reference being had to the accompanying drawings, forming part of this specification.

My invention relates to certain improvements in duplex pumping engines, and consists principally in the construction of the valve and the valve operating mechanism of the steam. cylinders, its principal object being to provide a simple form of valve and valve operating mechanism whereby the greatest efficiency and economy may be had while at the same time the valves are so arranged that one or other of the steam cylinders is at all times in communication with the steam supply and no dead point is possible. As is usual with duplex pumps the two steam pumps are placed side by side and so combined and arranged as to act-reciprocally upon the steam valve of each other, one piston acting to give steam to the other, after which it finishes its stroke and'then waits for its valve to be operated upon before it can renew its motion.

In the accompanying drawings, Figure 1 is a longitudinal section on the line 1 1, Fig. 2, of the steam end of a duplex pumping-engine constructed in accordance with my invention. Fig. 2 is a transverse sectional elevation of the same on the line 2 2, Fig. 3. Fig. 3 is a plan view of the same. Figs. 4 and 5 are transverse sectional elevations of the valves on the lines at 4. and 5 5, respectively, of Fig. 2; and Figs. 6 and 7 are detached perspective views of the valve-carrying shafts.

Referring to the drawings A, A, represent the cylinders preferably formed integral, and containing pistons, B, B, connected to piston rods, 0, O, which pass through the usual stuffing boxes, 0, c. on the respective piston rods are secured flanged collars,D, D, which operate positively upon levers E, E, respectively to give motion to the steam controlling valves, L and P. The casing of the valve chamber is bolted to or cast integral with the cylinders, A, A, and connects with a steam Serial No. 540,707. (No model.)

chest, F, by ports, f, f, the valve chamber s.team,-or other operating fluid, is connected to the upper portion of the steam chest, F, and from the two chambers in which the valves are contained extend to the cylinder, A, steam passages, h, h, and to the cylinder, A, steam passages, "i, t, of similar nature. The exhaust, J, is connected by passages, j, j, to the respective chambersin which the valves are located. The outer ends of the two valve chambers, G, G, are closed by removable heads, K, having stuffing boxes, is, through which pass the horizontally disposed operating shafts for the valves.

In the valve chamber, G, is a valve, L, of the construction shown in Figs. 1, 2 and 4, having two passages, Z, Z, which opens com munication between the valve chest, F, and when oscillated to the position shown in Fig. 4: opens communication between the port Z and the steam chest F, and the port h and the exhaustj, the opening of one port occurring immediately after the closing of the other to the steam supply. The valve is mounted upon a hollow shaft, N, and is secured thereto by a key, n, fitting within a recess, 12', in the valve, or, if desired this valve and shaft may be formed integral. hollow shaft, N, for that portion of its length within the two valve chambers is uniform, but that portion of the shaft which projects through the stuffing box and is. secured to the operating lever, E, is of smaller diameter. In the valve chamber, G, is a valve, P, which may be of the same construction as the valve, L, but is preferably so constructed and arranged as to open and close only the ports leading to the steam cylinder and not the port through which the steam passes from the steam chest to the valve chamber, as is the valve, L. The valve, P, is mounted loosely on the hollow shaft, N, and is provided with a groove or recess, 19, in which fits a key, 19, carried by a shaft, R, which fits within the hollow shaft, N, for a portion of its length and extends outside of the valve chest, and is connected to the lever, E, which receives its motion from the piston rod, 0. The hollow shaft, N, is recessed at if, for the passage ICC of the key,'p, so that free movement of the key in a circumferential line is permitted, and the valve may be freely oscillated by means of the lever, E, without in any manner affecting the position of the valve, L, on the hollow shaft, N.

In operation when the piston, 13, is midway of its stroke, as shown in Fig. 1 the valve, L, is in such position that steam is entering through the ports,f, and passing through the passage, Z, to the port, 72,1eading to the steam cylinder, A, and from the opposite side of the piston steam is escaping from the cylinder through the port, It, and out through the passage, Z, to the exhaust, 9'. At this time the piston of the cylinder, A, has reached the limit of its rearward movement and the valve, P, has been so moved as to close both of the ports, 2', 2', leading to the cylinder, A, as shown in Fig. 5. The piston, B, is moving forward and the collar, D, on the piston rod, 0, acts through the lever, E, and shaft, R, to so move the valve, P, in the direction indicated by the arrow, as to open communication between the port, '5 and the steam supply, and between the port, 1'', and the exhaust, 7", this movement continuing until the ports are fully opened, at which time the piston of the cylinder, A, has reached its full forward position, and the piston of the cylinder, A, is about midway of its forward stroke. The piston rod, 0, then acts through the collar, D, on the lever, E, and the hollow shaft, N, to move the valve, L, to a position opening the exhaust and cutting otf the entrance of steam from the steam chest to the valve chest at which timethe piston of the cylinder, A, is full forward. The two pistons operate alternately on the valve of the opposite steam cylinders, and the movement continues until the steam is shut off by the throttle valve.

With a valve mechanism of this character the pump may be operated with great economy in the amount of steam employed. There can be no dead point, as one of the valves is always in such position as to afford free communication between the cylinder and steam supply, and the working parts are reduced to a minimum, and are not liable to derangement or wear, while, if necessary, the removal of the levers, E, E, and the removal of the heads, K, of the valve chamber will give ready access to the valves for any necessary examination or repairs.

It is clear that the construction of the valves shown and the positions of the ports may be modified without departing from the spirit of my invention.

Having thus described my invention, what I claim, and desire to secure by Letters Patent, is Y 1. The combination in a duplex pumping engine, of the steam cylinders, the pistons and piston rods, two valve chambers, a steam chest common to both valve chambers, oscillating valves having ported peripheries provided in said valve chambers, concentric shafts carrying said valves and mechanism connecting the piston rod of one cylinder to the oppositely disposed valve which controls the steam supply of the opposite cylinder and vice versa, substantially as specified.

2. The combination in a duplex pumping engine of the two steam valve chambers, a steam chest communicating therewith, oscillating valves mounted in said chambers, a hollow shaft carrying said valves and secured to or formed integral with one of said valves, a second shaft fitting within the hollow shaft and operatively connected to one of said valves, with mechanism for connecting said shafts to the main piston rods, substantially as specified.

3. The combination in a duplex pump, of the two steam valve chambers, valves pro vided therein, entrance and exit ports for the operating fluid, ahollow shaft on which both valves are mounted and to which one of the valves is operatively connected, a second shaft fitting within the hollow shaft, and a radial key projecting from the second shaft to an orifice in the hollow shaft and connected to the second valve, substantially as specified.

4. The combination in a duplex pumping engine, of the two steam cylinders, the pistons and piston rods, two circular valve chambers, ports or passages extending therefrom to the steam cylinders, disk shaped valves adapted one to each of the circular valve chambers, ports arranged in the periphery of said valves at different points respectively on the periphery of each valve, independent concentrically arranged shafts carrying said valves, and mechanism connecting the piston rod of one cylinder to the oppositely disposed valve which controls the steam supply of the opposite cylinder, and vice versa, substantially'as specified.

5. The combination in a duplex pumping engine, of the two steam valve chambers, G, G, the steam chest, F, valves L, P, provided within said valve chambers, a hollow shaft, N, on which said valves are mounted and to which the valve, L is operatively connected, a shaft R, fitting within the hollow shaft, a key, 1), projecting from the shaft, B, through an opening in the hollow shaft and engaging in a recess in the valve, P, with mechanism for oscillating said shafts, substantially as specified.

6. The combination in a duplex pumping engine of the two steam cylinders, A, A, pistons, B, B, provided therein, piston rods, 0, G, flanged sleeves, D, D, thereon, the valve chambers, G, G, a steam chest, F, communicating with both valve chambers, valves, L, P, provided within said chambers, a hollow shaft, N, on which said valves are mounted and to which the valve, L, is operatively connected, there being in said shaft, N, an opening 11 a lever, E, connected to the hollow shaft and adapted to ioe operated on by the In witness whereof 1 have hereunto set my flanged sleeve D, ashaft,R, fitting partially hand this 2d'day of March, A. D. 1895. within the hollow shaft, a key 19, on said shaft,

R, projecting through said opening, M, and JOHN W. BOOTH.

{5 fitting into a recess, 17, in the valve, P, and a I lever, E, secured to the shaft, R, and adapted .Witnesses: to be operated upon by the sleeve, D, substan- EDMUND S. MILLs, tially as specified. J NO. E. PARKER. 

